Buku Sukino
Matematika Peminatan
Kelas XII
Kunci Jawaban BAB 3
LKS 1
Bagian B. Evaluasi Pemahaman dan Penguasaan Materi
1. Tentukan nilai kemiringan garis singgung dari kurva untuk masing-masing fungsi berikut.
a. f(x) = cotan x di x = π/3
b. g(x) = sin 1/4 x di x = 2π
c. h(θ) = tan θ - cotan θ di θ = π/4
d. p(θ) = sec θ + cosec θ di θ = - π/3
Jawaban :
a. f(x) = cotan x di x = π/3
f '(x) = - cosec2 x
f '(π/3) = - cosec2 π/3
f '(π/3) = - 1 / (sin2π/3)
f '(π/3) = - 1/(1/2 √3)2
f '(π/3) = - 1/(3/4)
f '(π/3) = - 4/3
b. g(x) = sin 1/4 x di x = 2π
g ' (x) = 1/4 cos 1/4 x
g ' (2π) = 1/4 cos 1/4 . 2π
g ' (2π) = 1/4 cos π/2
g ' (2π) = 1/4 . 1
g ' (2π) = 1/4
c. h(θ) = tan θ - cotan θ di θ = π/4
h ' (θ) = sec2 θ - (- cosec2 θ)
h ' (θ) = sec2 θ + cosec2 θ
h ' (π/4) = sec2 (π/4) + cosec2 (π/4)
h ' (π/4) = 2 + 2
h ' (π/4) = 4
d. p(θ) = sec θ + cosec θ di θ = - π/3
p ' (θ) = sec θ . tan θ - cosec θ . cotan θp ' (- π/3) = sec (- π/3). tan (- π/3)- cosec (- π/3) . cotan (- π/3)
p ' (- π/3) = 2 . - √3 - (- 2/√3) . (- 1/3 √3)
p ' (- π/3) = - 2√3 - 2/3
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